<div class="composition-layout">
    <div style="float:left;height:100%;">1</div>
    <div style="width:66%;float:right;height:100%;border-left: 1px solid #cccccc;">
        <div style="height:50%;;width:100%;border-bottom: 1px solid #cccccc;">2</div>
        <div style="height:auto;;width:100%;">3</div>
    </div>
</div>

